Can you provide more information? There really is no way to "stop" adverse possession, but depending on the facts, you may have defenses available. The only true way to end adverse possession is by legislative change. For example, in Washington there is a bill, HB 1479, which would effectively put a stop to all claims of adverse possession, but until that bill is passed, there is really no way to stop someone from using adverse possession as a way to steal another's property.