the following is my test.When click the link named "Load",the radio does not checked.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "
http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>jQuery EasyUI</title>
<link rel="stylesheet" type="text/css" href="../themes/default/easyui.css">
<script type="text/javascript" src="../jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="../jquery.easyui.min.js"></script>
<script type="text/javascript">
function loaddata(){
$('#ff').form('load',{
sex1:'2',
sex2:'1'
});
}
</script>
</head>
<body>
<h1>Form Demo</h1>
<div>
<a href="#" onclick="loaddata()">Load</a>
</div>
<div style="background:#fafafa;padding:10px;width:300px;height:300px;">
<form id="ff" method="post">
<div>
sex1
<select name="sex1" style="width:80px">
<option value="1">man</option>
<option value="2">women</option>
</select>
</div>
<div>
sex2
<INPUT type="radio" name="sex2">man
<INPUT type="radio" name="sex2">women
</div>
</form>
</div>
</body>
</html>