/*FormPanel*/
FormPanel_TradeInfoWeek = Ext.extend(Ext.form.FormPanel,{
	
	/*构造函数*/
	constructor:function(){
		FormPanel_TradeInfoWeek.superclass.constructor.call(this,{
								//renderTo:Ext.getBody(),
								labelWidth:80,
								height:300,
								width:300,
								baseCls:"x-plain",
								defaultType:"textfield",
								defaults:{anchor:"100%"},
								style:"padding:5px",
								items:[{
											xtype:"combo",
											fieldLabel:"区 域",
											mode:"local",
											displayField:"region",
											triggerAction:"all",
											emptyText:"请选择地区",
											editable:false,
											name:'tiw.region',
											store:new Ext.data.SimpleStore({
												fields:["region"],
												data:[["1区"],["2区"],["3区"],["4区"]]
											})									
										},{
											xtype:"combo",
											fieldLabel:"房屋类型",
											mode:"local",
											displayField:"h_value",
											triggerAction:"all",
											emptyText:"请选择房屋类型",
											editable:false,
											name:'tiw.type',
											store:new Ext.data.SimpleStore({
												fields:['h_type','h_value'],
												data:[[1,"商品房"],[2,"二手房"]]
											})
										},{
											xtype:"numberfield",
											fieldLabel:"住宅套数",
											name:'tiw.zzCount'
										},{
											xtype:"numberfield",
											fieldLabel:"非住宅套数",
											name:'tiw.fzzCount'
										},{
											xtype:"numberfield",
											fieldLabel:"住宅交易额",
											name:'tiw.zzValue'
										},{
											xtype:"numberfield",
											fieldLabel:"非住宅交易额",
											name:'tiw.fzzValue'
										},{
											xtype:"numberfield",
											fieldLabel:"住宅面积",
											name:'tiw.zzArea'
										},{
											xtype:"numberfield",
											fieldLabel:"非住宅面积",
											name:'tiw.fzzArea'
										},{
											xtype:"numberfield",
											fieldLabel:"住宅均价",
											name:'tiw.zzAvgPrice'
										},{
											xtype:"numberfield",
											fieldLabel:"非住宅均价",
											name:'tiw.fzzAvgPrice'
										},{
											xtype:"datefield",
											fieldLabel:"统计日期",
											format:"Y-m-d",
											value:new Date(),
											name:'tiw.date'//value:"1984-11-20" readOnly:true,
										}	
								]
														
		});
		this.addEvents("submit");
	},
	
	/*提交*/
	submit:function(){
			try{
				  this.getForm().submit({url:'addTiw.action',success:function(form,action){alert("提交成功");},waitTitle:"数据提交",waitMsg:"数据传送中,请稍候...",scope:this});
			}catch(e){
				
			}
	},
	/*初始化*/
	reset:function(){
		this.getForm.reset();
	}
});

问题解决了，在submit方法中写了reset方法，这样导致在没有完全体较之前表单中的数据就被初始化了，所以没接收到表单数据。
解决方法： 在submit方法的 success方法中写reset方法就行了。