The invention concerns flat weft-knitting field in the textile industry, particularly relates to a new method that can adopt the flat weft knitting machine to continuously weave the knitwear whose that appearance can be seen structure texture pattern of X-yarn by a semi-turn (or semi-twist), Y-yarn by the semi-turn and the special-purpose yarn guiding mouth thereof. There is two or three parallel positioned yarn guiding holes provided in a yarn guiding mouth. X-yarn and Y-yarn can be independently fed through two guiding holes being parallel placement; Alternatively, X-yarn, Y-yarn and C-yarn can be independently fed through the three guiding holes being parallel placement; Or, Z-yarn can be fed through outside of the two or three guiding holes being parallel placement. To achieve the fabric whose surface is X-yarn by a semi-turn and Y-yarn by another semi-turn, or appearance in most is X-yarn, and Y-yarn in small part; or most of the appearance is X-yarn and C-yarn by a semi-turn and Y-yarn and C-yarn by another semi-turn; or pattern on the appearance includes several patterns aforesaid, inside is Z-yarn, which are plating knitting, there is no need to change the yarn guiding mouth or the yarn by using the present invention.