I want to show the name and number of employee in this doctype

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i want to show the name and number of employee in this doctype
i do not want to change the this

You can create a new field in the Appraisal doctype (using customization otherwise directly) for employee number and specify the type of data you want to fetch. For example, if you want to fetch the mobile number.
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thanks for your response i mean when i want to display in the custom field the name of doc how?
the employee number in the system like HR-EMP-00006

To achieve this, you need to create a client script to retrieve the employee name/ID and automatically display it in your employee number field when you select the employee.