diff --git a/src/core/sv_parser.rs b/src/core/sv_parser.rs
index baef08f..2f22df5 100644
--- a/src/core/sv_parser.rs
+++ b/src/core/sv_parser.rs
@@ -158,6 +158,55 @@ pub fn make_fast_from_syntaxtree(syntax_tree: &SyntaxTree, path: &PathBuf) -> Re
                     }
                 }
             }
+            RefNode::ParameterDeclaration(x) => {
+                if let Some(id) = unwrap_node!(x, ParameterIdentifier) {
+                    let id = get_identifier(id).unwrap();
+                    let name = syntax_tree.get_str(&id).unwrap();
+                    match unwrap_node!(x, ParameterDeclarationParam, ParameterPortDeclarationParamList) {
+                        Some(RefNode::ParameterDeclarationParam(param_node)) => {
+                            // println!("{:?}", param_node);
+                            let keyword_locate = param_node.nodes.0.nodes.0;
+                            // println!("keyword {:#?}", keyword_locate);
+                            let (start_line, start_character) = (id.line, get_column_by_offset(&content, keyword_locate.offset) as u32);
+                            let (mut end_line, mut end_character) = (id.line, start_character + id.len as u32);
+                            let net_type = match unwrap_node!(param_node, DataType) {
+                                Some(RefNode::DataType(data_type)) => {
+                                    let id = unwrap_node!(data_type, SimpleIdentifier, Keyword);
+                                    if id == None {
+                                        "wire"
+                                    } else {
+                                        let id = get_identifier(id.unwrap()).unwrap();
+                                        syntax_tree.get_str(&id).unwrap()
+                                    }
+                                }
+                                _ => "wire"
+                            };
+                            let init = if let Some(init) = unwrap_node!(param_node, ConstantMintypmaxExpression) {
+                                match init {
+                                    RefNode::ConstantMintypmaxExpression(expression) => {
+                                        // println!("expression {:?}", x);
+                                        let param_init = sv_parser::NeedParseExpression::Parameter(expression.clone());
+                                        let (exp, last_locate) = parse_expression(&syntax_tree, &param_init);
+                                        (end_line, end_character) = if last_locate != None {
+                                            // println!("param {:?} lastlocate {:?}", name, last_locate);
+                                            (last_locate.unwrap().line, (get_column_by_offset(&content, last_locate.unwrap().offset) + last_locate.unwrap().len) as u32)
+                                        } else { 
+                                            (end_line, end_character) 
+                                        };
+                                        // println!("end pos {} {}", end_line, end_character);
+                                        exp
+                                    }
+                                    _ => "unknown".to_string()
+                                }
+                            } else {
+                                "unknown".to_string()
+                            };
+                            hdlparam.add_parameter(name, net_type, init.as_str(), start_line, start_character, end_line, end_character);
+                        }
+                        _ => ()
+                    }
+                }
+            }
             RefNode::PortDeclaration(x) => {
                 if let Some(id) = unwrap_node!(x, InputDeclaration, OutputDeclaration, InoutDeclaration) {
                     let id = get_identifier(id).unwrap();
diff --git a/src/hover/vhdl.rs b/src/hover/vhdl.rs
index 24269b5..247fa46 100644
--- a/src/hover/vhdl.rs
+++ b/src/hover/vhdl.rs
@@ -1,9 +1,47 @@
+use std::{path::PathBuf, str::FromStr};
+
+use log::info;
 use tower_lsp::lsp_types::*;
 use crate::server::LSPServer;
 
+use super::{from_lsp_pos, to_escape_path};
+
 pub fn hover(server: &LSPServer, params: &HoverParams) -> Option<Hover> {
-    let design_file = server.srcs.design_file_map.write().unwrap();
-    
-    
-    None
+    let uri = &params.text_document_position_params.text_document.uri;
+    let pos = params.text_document_position_params.position;
+    let file_id = server.srcs.get_id(&uri).to_owned();
+    server.srcs.wait_parse_ready(file_id, false);
+    let projects = server.srcs.design_file_map.read().ok()?;
+
+    let path = match PathBuf::from_str(uri.path()) {
+        Ok(path) => path,
+        Err(error) => {
+            info!("error happen in <goto_include_definition>: {:?}", error);
+            return None;
+        }
+    };
+    let escape_path = to_escape_path(&path);
+    let escape_path_string = escape_path.to_str().unwrap_or("");
+    if escape_path_string.len() == 0 {
+        info!("error happen in [vhdl_parser_pipeline], escape_path_string is empty");
+        return None;
+    }
+    let project = match projects.get(escape_path_string) {
+        Some(project) => project,
+        None => return None
+    };
+
+    let source = project.get_source(&escape_path)?;
+
+    let ent = project.find_declaration(&source, from_lsp_pos(pos))?;
+
+    let value = project.format_declaration(ent)?;
+
+    Some(Hover {
+        contents: HoverContents::Markup(MarkupContent {
+            kind: MarkupKind::Markdown,
+            value: format!("```vhdl\n{value}\n```"),
+        }),
+        range: None,
+    })
 }
\ No newline at end of file