在AWS Step Function中，可以通过使用ChoiceState和FailState，实现在满足特定条件时停止状态机的执行。在ChoiceState中，定义一个条件并将其与FailState绑定，如果该条件满足，则状态机将立即终止。

以下是一个示例状态机，它在检测到状态输入为'stop”时会立即停止。

{
    "StartAt": "CheckInput",
    "States": {
        "CheckInput": {
            "Type": "Choice",
            "Choices": [
                {
                    "Variable": "$.input",
                    "StringEquals": "stop",
                    "Next": "StopExecution"
                }
            ],
            "Default": "ContinueExecution"
        },
        "StopExecution": {
            "Type": "Fail",
            "Error": "ExecutionStopped",
            "Cause": "Input was 'stop', execution stopped."
        },
        "ContinueExecution": {
            "Type": "Pass",
            "Result": "Execution continued"
        }
    }
}