Later on, he studied a Chinese mathematics book, "Sanpo Toso" under his relative, Soan SUMINOKURA, and published his book, "Jinkoki" (a mathematical book covering almost all important mathematics useful for daily professional life in the Edo period) in 1628.
のち一族の角倉素庵のもとで中国の数学書『算法統宗』の研究を行い、それをもとに1628年(寛永5年)、著書『塵劫記』を出版した。