How can I deploy web service?

A good place to start would be by going through the material found here:
Windows Communication Foundation[^]

This may be of interest: Deploying WCF Applications with ClickOnce[^]

Then there is a number of how-tos':
How to: Host a WCF Service in IIS[^]
How to: Host a WCF Service in WAS[^]
How to: Host a WCF Service in a Managed Windows Service[^]
How to: Host a WCF Service in a Managed Application[^]
How to: Host a WCF Service Written with .NET Framework 3.5 in IIS Running Under .NET Framework 4[^]

Update: additional how-tos'
How to: Create a Basic WCF Web HTTP Service[^]
How to: Expose a Contract to SOAP and Web Clients[^]
How to: Create a Service That Returns Arbitrary Data Using The WCF Web HTTP Programming Model[^]
How to: Create a Service That Accepts Arbitrary Data using the WCF REST Programming Model[^]
How to: Create an AJAX-Enabled WCF Service and an ASP.NET Client that Accesses the Service[^]
How to: Add an ASP.NET AJAX Endpoint Without Using Configuration[^]
How to: Use Configuration to Add an ASP.NET AJAX Endpoint[^]
How to: Choose between HTTP POST and HTTP GET requests for ASP.NET AJAX Endpoints[^]

Deployment of the service depends on how you are hosting the service. Basically it's the same for all hosting cases - copy the files to where they need to be, and update the configuration to reflect any required changes.

Best regards
Espen Harlinn