<apex:page controller="DynamicBindingController">
     <apex:pageMessages id="pageMessages" />
     <h1>These fields are speicified from a custom list</h1>
     <apex:form >
           <apex:pageBlock mode="edit">
                <apex:pageBlockButtons >
                      <apex:commandButton value="Save" action="{!createOpportunities}" />
                </apex:pageBlockButtons>
                <apex:pageBlockSection title="Dynamic fields" columns="1" showHeader="true">
                     <apex:repeat value="{!fieldNames}" var="FieldName" >
                          <apex:pageBlockSectionItem >
                               <apex:outputLabel value="{!FieldName}" />
                               <apex:inputField value="{!dummyOpp[FieldName]}" />
                          </apex:pageBlockSectionItem>
                     </apex:repeat>
               </apex:pageBlockSection>
          </apex:pageBlock>
     </apex:form>
</apex:page>

Controller:

public without sharing class DynamicBindingController {
   public Opportunity dummyOpp {get; set;} 
   public List<String> fieldNames {get; set;}

   public DynamicBindingController(){
      //Initialize the placeholder Opportunity
      dummyOpp = new Opportunity();

      //Now let's get the List of fields from our custom setting
      fieldNames = new List<String>();
      for(Opportunity_Dynamic_Field_List__c fieldName : Opportunity_Dynamic_Field_List__c.getall().values()){
         fieldNames.add(fieldName.Name);
      }
   }

   public PageReference createOpportunities(){
      try{
         //Create the new opportunity and re-direct to it
         insert dummyOpp;
         return new PageReference('/'+dummyOpp.id);
      }catch(Exception ex){
         ApexPages.Message msg = new ApexPages.Message(ApexPages.Severity.Error, ex.getMessage());
         ApexPages.addMessage(msg); 
      }
      return null;
   }

    public Opportunity getOpportunity(String id){
       String soql = 'Select id ';
       for(Opportunity_Dynamic_Field_List__c fieldName : Opportunity_Dynamic_Field_List__c.getall().values()){
          soql = soql + ', ' + fieldName.Name;
       }
       soql = soql + ' From Opportunity where id = :id';
       return (Opportunity)Database.Query(soql);
    }
}

befor running code Need to create custom settings.

use a list custom setting Opportunity_Dynamic_Field_List__c which has 4 entries in it: “Name”, “CloseDate”, “Description”, and “StageName”.
Create few records in custom settings and then try the code.

Here you can find more info about that:
http://opfocus.com/blog/how-to-dynamically-add-a-configurable-list-of-fields/