As an authority in the study of written characters, Wang was highly knowledgeable about different styles of seal script. The 500 or so seals of his displayed in the collection Yuzhao Shanfang Yinxuan show how complete his mastery of the form was, from ancient guxi seals of state, to the qinyin and hanyin seals of the Qin and Han dynasties, and the styles of the oracle-bone-script and wanzhe schools.
王壯為精研文字學，因而印風廣博，由其個人的《玉照山房印選》中五百餘方的作品中，可以看到他對於古璽、秦印、漢印、甲骨派、皖浙派等風格無不融會貫通。