The　flow　fields　and　cooling　effectiveness　of　the　film　cooling　from　a　row　of　cylindrical　angled　holes　embedded　in　different　transverse　slots　configurations　were　investigated　numerically　in　several　blowing　ratios,　to　reveal　the　effects　of　narrow　trench,　wide　trench,　and　inclined　trench　with　the　same　trench　depth　on　the　film　cooling　performance　from　the　flowing　mechanism.　The　simulation　results　of　inclined　trench　model　were　compared　with　experimental　data　of　shaped　holes.　It　is　found　that,　for　the　embedded　holes,　the　jet　injected　into　the　slot　loses　momentum　at　the　exit　of　the　slot;　the　penetration　of　the　film　secondary　flow　into　the　cross　flow　is　suppressed　and　the　secondary　flow　is　pushed　downwards　on　to　the　surface,　resulting　in　better　coverage.　At　low　blowing　ratio,　the　inclined　trench　has　superior　cooling　effect,　while　at　high　blowing　ratio　the　narrow　trench　has　superior　cooling　effect.　A　lateral　vortex　appears　in　the　wide　trench;　a　pair　of　taper　vortex　appear　in　the　narrow　trench;　and　a　pair　of　counter　rotating　vortex　appear　in　the　inclined　trench.　The　trailing　edge　wall　of　the　trench　plays　an　important　role　in　the　lateral　diffusion　of　the　cooling　film.