Control method of pattern color of fall-on printing of disperse dye for terylene textile

The invention discloses a control method of a pattern color of fall-on printing using disperse dye for terylene textile, and enriches the color of the textile and largely promotes the sharpness and brilliant degree of the printing products. According to the technical scheme, the method comprises controlling of the pressure of a printing magnetic roller with a computer, matched printing screens with different opening rates, and designed and blended printing color paste. The printing color paste comprises the following ingredients by mass: 0.0%-9.5% of middle-temperature SE type or high-temperature S type industrial disperse dye, 3-20% of sodium alginate, and 2-15% of sodium hexametaphosphate, citric acid, urea and a dye-proof salt S, balance being deionized water of corresponding amount, total amount being 100%; the viscosity of the sodium alginate is 500-1000mPa*S, moisture is no more than 15%, pH ranges from 6.0-7.0, calcium content is no more than 0.2%, water insoluble substance is no more than 0.3%, the content of salts of heavy metal such as lead or arsenic is no more than 0.0002%, the mesh numbers of the matched printing screens with different opening rates range from 170 to 325, and the opening rates range from 0-100%.