Methanesulfonic acid is a kind of caustic chemical, which has a wide application prospect in electroplating field. It has been proved to be a good substitute for fluoroboric acid or phenol sulfonic acid. Methanesulfonate electroplating solution has been applied to tin and tin lead alloy electroplating, and the product features are as follows: 1. Bright pure tin electroplating of methanesulfonate type, with fine crystal, uniform coating, bright silver white, good solderability, is suitable for electronic industry. 2. The bath has high plating speed, wide current density range, fast deposition speed and excellent deep plating ability. 3. Good weldability can be maintained after standard aging test or long-term storage. 4. No fluorine boric acid, easy to treat waste water, low corrosiveness, conducive to environmental protection.