Letter paper. According to the official website of Zhiyouji, the application for party membership must be written on official letter paper, that is, letter paper with horizontal stripes on it, preferably blue or green, and either single or double lines are acceptable. Manuscript paper is a kind of paper with square grids. It is used by literary enthusiasts to write poetry, prose, novels and other literary works, and submit them to the publishing house or editorial department for publication. The words and punctuation marks must be written in the square grids for convenience. Calculate royalties.