This invention provides a process for improving the shrimps and lobsters, which comprises quick-freezing the prawns, color of prawns, shrimps and lobsters to a certain low temperature before the heat treatment, a step conventionally used for changing the color of prawns, shrimps and lobsters to a beautiful pink red, and then cooling the heat treated prawns, shrimps or lobsters immediately after the heat treating step, so that the depth of color change can be easily regulated within an appropriate range, preventing the prawns, shrimps or lobsters from losing body fluid and destroying any qualities of freshness.
