The morphologies of three types of plant protein particles, which are derived from wheat, soy, and broad bean, were characterized by SEM. In our preliminary study, the plant protein particles were applied in cigarette filter to investigate their functional features. The SEM results reveal that the plant protein particles have many globular proteins on the surface. The filter containing plant protein particles can reduce the amount of hazardous substances in cigarette mainstream smoke, comparing with the filters without plant protein particles. The reduction rates of the hazardous substances are as follow: Crotonaldehyde reduction: 18.76% by wheat protein, 19.42% by soy protein and 19.20% by broad bean protein. Among which, the broad bean protein exhibits notable effects on reducing phenol, by 16.25%. Compared to the sample, the filter with plant protein particles can improve comfort.