This article tried to examine the emergence of Chinese and Siamese modern press that were originally from the Western missionary press in the 19th century. The first Western-style press in China, Chinese Monthly Magazine (《察世俗每月统记传》), was introduced by missionaries; Robert Morrison and William Milne. The purpose of Chinese Monthly Magazine was to spread Christian beliefs and modern knowledge. The Chinese Monthly Magazine, published in Malacca, was circulated throughout all the Chinese communities in the region; Siam, Cochin-China, and China itself. In Siam, the first publishing house was established by an American Christian. Bangkok Recorder, founded by Dan Beach Bradley (1804-1873), had a big influence Siam printing history despite its short life. Bradley’s work demonstrates the missionary network through the British empire colonial territory- American Missionaries used printing centers in the British Raj and in British Burma in spreading their printing media. Thus, newspapers in Southeast Asia and China provide a good example of colonial modernity and imperialism in the region. The newspapers by missionary show the circulation of news and information by the transnational print media of the colonial era and the impact of missionary works with the development of press in East Asian and Southeast Asia. This article examined the modern newspapers in Siam and China indicated to the transnational colonial modernization under the missionary connection and how the results of these colonial modernization process had an affected-on Siam and China modernization in that period.