A ball seat configured for multistage stimulation in oil and gas wells includes bottom sub, slips, sealing element and mandrel. The mandrel is a cone frustum, and it's exterior is encased by the sealing element and slips. One end of the sealing element is attached to one end of slip, the end of the cone frustum mandrel with the smallest exterior diameter is completely encased by slips. One end of the bottom sub is attached the other end of the slip. The bottom sub includes a threaded shearing connecting structure, which is designed to connect the setting tool adaptor used to deploy the ball seat into the oil or gas well. The sealing element is a two-segment structure, the hardness of the first segment is lower than that of the second segment.
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