1. Steam the crab for 15 minutes. The specific operation steps are as follows: Step 1: Soak the crab in salt water for a period of time, and then wash it with water, as shown in the following figure.

2. Step 2: Wash the mud on the river crab with a toothbrush, as shown in the figure below.

3. Step 3: Put a proper amount of water into the steamer, and put the river crab into the pot, as shown in the following figure.

4. steam for 15 minutes in the fourth step, as shown in the figure below.

5, the fifth step is done, as shown in the figure below.