Create a Web test plan

1, add the thread group test original, give the frequency and number of sending requests.

Select the test plan, right-click and choose--add--threads (Users) from the popup shortcut menu--threadgroup

Continue: If the execution in the sampler fails, the request will not stop and continue execution.
Start Next thread loop: ignores the error, the thread is currently looping the error and executes the next loop.
Stop thread: Only the current thread stops and does not affect other threads executing
Stop test: The currently executing thread ends after all execution has completed
Stop Test now: Stop immediately

Set Number of threads: Set the number of threads to n
Set the transition period: X
Set the number of times to perform tests

This transition period tells JMeter how long it will take to "accelerate" to the total number of threads selected. If you use n threads and the increase is x seconds, then JMeter will take x seconds to start and run N threads

2. Add default HTTP request properties

Thread Group--right mouse button--add--config Element--http Request Defaults

Create a Web test plan